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<DIV CLASS="navbar"><A HREF="http://vt100.net/"><IMG CLASS="button" SRC="vt100.net-logo.png" ALT="VT100.net" HEIGHT="16" WIDTH="102"></A> VT220 Programmer Reference Manual<TABLE WIDTH="100%">
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<TD ALIGN="LEFT"><A HREF="chapter4.html">Chapter 4</A></TD>
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<TABLE ID="T4-1">
<CAPTION>Table 4-1 C0 (ASCII) Control Characters Recognized</CAPTION>
<THEAD>
<TR VALIGN="BOTTOM">
<TH ALIGN="LEFT">Mnemonic</TH>
<TH ALIGN="LEFT">Code</TH>
<TH ALIGN="LEFT">Name</TH>
<TH ALIGN="LEFT">Action Taken</TH>
</TR>
</THEAD>
<TBODY>
<TR VALIGN="TOP">
<TD>NUL</TD>
<TD>0/0</TD>
<TD>Null</TD>
<TD>Ignored when received.</TD>
</TR>
<TR VALIGN="TOP">
<TD>ENQ</TD>
<TD>0/5</TD>
<TD>Enquiry</TD>
<TD>Answerback message is
generated.</TD>
</TR>
<TR VALIGN="TOP">
<TD>BEL</TD>
<TD>0/7</TD>
<TD>Bell</TD>
<TD>Generates bell tone if bell is
enabled.</TD>
</TR>
<TR VALIGN="TOP">
<TD>BS</TD>
<TD>0/8</TD>
<TD>Backspace</TD>
<TD>Moves cursor to the left one
character position: if cursor is at left margin, no action occurs.</TD>
</TR>
<TR VALIGN="TOP">
<TD>HT</TD>
<TD>0/9</TD>
<TD>Horizontal tabulation</TD>
<TD>Moves cursor to next tab stop,
or to right margin if there are no more tab stops. Does not cause autowrap.</TD>
</TR>
<TR VALIGN="TOP">
<TD>LF</TD>
<TD>0/10</TD>
<TD>Linefeed</TD>
<TD>Causes a linefeed or a new line
operation, depending on the setting of new line mode.</TD>
</TR>
<TR VALIGN="TOP">
<TD>VT</TD>
<TD>0/11</TD>
<TD>Vertical tabulation</TD>
<TD>Processed as LF.</TD>
</TR>
<TR VALIGN="TOP">
<TD>FF</TD>
<TD>0/12</TD>
<TD>Form feed</TD>
<TD>Processed as LF.</TD>
</TR>
<TR VALIGN="TOP">
<TD>CR</TD>
<TD>0/13</TD>
<TD>Carriage return</TD>
<TD>Moves cursor to left margin
on current line.</TD>
</TR>
<TR VALIGN="TOP">
<TD>SO (LS1)</TD>
<TD>0/14</TD>
<TD>Shift out<BR>(Lock shift G1)</TD>
<TD>Invokes G1 character set into
GL. G1 is designated by a select-character-set (SCS) sequence.</TD>
</TR>
<TR VALIGN="TOP">
<TD>SI (LS0)</TD>
<TD>0/15</TD>
<TD>Shift in<BR>(Lock shift G0)</TD>
<TD>Invoke G0 character set into
GL. G0 is designated by a select-character-set sequence (SCS).</TD>
</TR>
<TR VALIGN="TOP">
<TD>DC1</TD>
<TD>1/1</TD>
<TD>Device Control 1</TD>
<TD>Also referred to as XON. If
XOFF support is enabled, DC1 clears DC3 (XOFF), causing the terminal to continue transmitting characters
(keyboard unlocks) unless KAM mode is currently set.</TD>
</TR>
<TR VALIGN="TOP">
<TD>DC3</TD>
<TD>1/3</TD>
<TD>Device Control 3</TD>
<TD>Also referred to as XOFF. If
XOFF support is enabled, DC3 causes the terminal to stop transmitting characters until
a DC1 control character is received.</TD>
</TR>
<TR VALIGN="TOP">
<TD>CAN</TD>
<TD>1/8</TD>
<TD>Cancel</TD>
<TD>If received during an escape or
control sequence, terminates and cancels the sequence. No error character is displayed.
If received during a device control string, the DCS is terminated and no error
character is displayed.</TD>
</TR>
<TR VALIGN="TOP">
<TD>SUB</TD>
<TD>1/10</TD>
<TD>Substitute</TD>
<TD>If received during escape or
control sequence, terminates and cancels the sequence. Causes a reverse question mark
to be displayed. If received during a device control sequence, the DCS is terminated
and reverse question mark is displayed.</TD>
</TR>
<TR VALIGN="TOP">
<TD>ESC</TD>
<TD>1/11</TD>
<TD>Escape</TD>
<TD>Processed as escape sequence
introducer. Terminates any escape, control or device control sequence which is in
progress.</TD>
</TR>
<TR VALIGN="TOP">
<TD>DEL</TD>
<TD>7/15</TD>
<TD>Delete</TD>
<TD>Ignored when received. Note:
May not be used as a time fill character.</TD>
</TR>
</TBODY>
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